The seas have always been a way of quick and affordable trade
fast and load-lifting ( 10 carts) of the court using the mechanics of the horse changes could change the whole world
to begin with simple enough ships that can use the RAM. Vulnerable to fire arrows
Drakar
Such ships should be very expensive for crafting, but as a result would bring profit to their owners, allowing you to easily and quickly transport large quantities of cargo. Besides a possible pirate attack.